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/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.wst.ws.internal.datamodel;
import java.util.Enumeration;
/**
* This is the abstract class for relationships in a Model.
*/
public interface Rel
{
// Copyright
public static final String copyright = "(c) Copyright IBM Corporation 2000, 2002.";
/**
* Returns the name of this relationship. Relationship names
* cannot be changed.
* @return String The name of the relationship.
*/
public String getName ();
/**
* Returns the node that owns this relationship.
* @return Node The node that owns this relationship.
* This method never returns null, that is, relationships
* cannot exist in the absence of a node.
*/
public Element getSourceElement();
/**
* Returns an enumeration of all nodes in this relationship.
* @return Enumeration The nodes in this relationship.
* This method never returns null.
*/
public Enumeration getTargetElements ();
/**
* Returns the number of nodes in this relationship.
* @return int The number of nodes in this relationship.
* This method never returns a negative value.
*/
public int getNumberOfTargetElements ();
/**
* Adds a connection to this relationship. This method is
* intended for use by derivations of the Model framework,
* not by users of the framework. Connection objects should
* only be constructed, added, removed and retrieved by
* implementations of the Node and Rel interfaces.
* @param connection The connection to add.
*/
public void addConnection ( Connection connection );
/**
* Removes a connection from this relationship. This method is
* intended for use by derivations of the Model framework,
* not by users of the framework. Connection objects should
* only be constructed, added, removed and retrieved by
* implementations of the Node and Rel interfaces.
* @param connection The connection to remove.
* @return boolean True if the connection was found and removed.
*/
public boolean removeConnection ( Connection connection );
/**
* Returns the Connection object for the given target node.
* This method is intended for use by derivations of the Model
* framework, not by users of the framework. Connection objects
* should only be constructed, added, removed and retrieved by
* implementations of the Node and Rel interfaces.
* @param targetNode The node to find the Connection to.
* @return Connection The connection, or null if none.
*/
public Connection getConnectionTo ( Element targetElement );
}
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